To those who do, here's some questions, feel free to describe your own creations!

What inspires your costumes? Do you base them on a series or fandom, or are they completely your own creation?

Do you give your characters a backstory, or come up with "in-character" explanations for parts of the costume?

Overall, why do you do it? Do you like the freedom of original characters/designs? Do you like the challenge of coming up with a design from scratch, or do you find it more personal than strict recreation?

I have a OC biased off of the Kingdom Hearts series. It came around because my friend was bored and asked me to design an original key-blade. After I finished he decided to make it for me!

As for backstory, I usually come up with it on the spot because I never want to prepare. Also, Being the creative person I am, It's easy for me to do. Also, since my creativity is so rampant, Creating OC's also help me let some of it out!